CVE-2025-38107: Debian Linux

High severity, CVSS 7.0. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: net_sched: ets: fix a race in ets_qdisc_change() Gerrard Tai reported a race condition in ETS, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.

Affected products

• Debian Debian Linux: version 11.0 only
• Linux Linux Kernel: from 5.4.213, before 5.5 (fixed in 5.5); from 5.10.142, before 5.10.239 (fixed in 5.10.239); from 5.15.66, before 5.15.186 (fixed in 5.15.186); from 5.19.8, before 6.0 (fixed in 6.0); from 6.0.1, before 6.1.142 (fixed in 6.1.142); from 6.2, before 6.6.94 (fixed in 6.6.94); …

Published 2025-07-03. Last modified 2026-07-30.